Improvement in lifting-clamps for pumps



UNITED STATES PATENT OFFICE.

WILLIAM H. DOWNING, OF `PIONEER, PENNSYLVANIA.

IMPROVEMENT lN LlFTlNG-CLAMPS FOR PUMPS.

Specification forming part of Letters Patent No. 101,595, dated April 5, 1870; antedated March 29, 1870.

.To all whom it may concern:

Be it known that I, WILLIAM H. DOWNING, ot Pioneer, in the county of Venango and State of Pennsylvania, have invented a new and useful Improvement in Tubing-Clamps; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, referencebeing had to the accompanying drawing, forming a part ot' this speciiication.

This invention relates to an improvement in mechanism for clamping and raising tubing from oil-wells by means of a derrick or shears or a tackle-block arranged in any suitable manner for that purpose; and the invention consists in the construction and operation of the clamp, as hereinafter more fully described.

The accompanying drawing represents a perspective view of a clamp constructed according to my invention.

Similar letters ot' reference indicate correspon din g parts.

This clamp is formed of two parts, A and B, and cach part is a semicircle, C, at the end of a vertical plate, D. These two parts -A and B slip together, as seen at e in the drawing, the under side of B being rabbeted to receive the semicircle C of the part A. On the lower part of the circle of A there are lugs or projections j', and in the lower part of the circle of B there are recesses g which receive the lugs f when A is raised up in contact with a tube.

H H represent hails attached to pins i in each of the parts A B, the upper ends of which bails are connected with the tackle-block, to which power is applied in raising the tube.

jj are lugs for supporting the bails in ahori- Zontal position when unscrewing the upper tube.

The circles C C are not entire semiciroles, but arcs of circles, so as to adapt them to tubes of different sizes. 'Io allow oi this adjustability the parts fit loosely together. lhe upper portion ot' the circles bear against the opposite sides of the tube when power is applied for raising, while the lower portions separate, but the parts are held together b v the lugs f.

When used, this clamp is placed on the tube immediately below the collar ot' the tube, so thatin raising the tube the collar rests on the top of the clamp. However small the collar on the tube may be, the adjustability of the clamp is such that a lirm hold will be obtained upon the tube.

When the size of the collar on the tube will allow, the clamp may be slipped down over the end of the tube. Otherwise one part of the clamp is placed on one side of the tube and the other below it on theopposite side, when by raising the lower one the two will lock together around the tube, as seen in the drawing.

Having thusdescribed myinvention,1 claim as new and desire to secure by Letters Patent- A tube-clamp formed of the parts A and B, arranged and operating substantially as and for the purposes described.

The above specification of my invention signed by me this 29th day of June, 1869.

WM. H. DOWNING.

Witnesses FRANK BLOCKLEY, ALEX. F. ROBERTS. 

